Are you saying ST lowest RCCB sensitivity for lights and fans is 100 mA, or are you saying ST requires metal awnings and metal roofs to be electrically grounded? The former is true, but I have never read the latter. Could you please cite a source if you mean the latter?

Here you go mate
https://www.st.gov.my/en/contents/files/dow...N_DOMESTIK1.pdf

Thanks! Most appreciated!

Looks like ST has finally published an updated guidebook (Dated 1st December 2021) covering a lot more information. Lampiran III and V are particularly important (Pages 59 and 61) as it covers the current carrying capacity of wires, and is way more conservative than any manufacturer tables. From the ST table, 2.5 mm² cables no longer are a 20 A MCB circuit....

Well, same issue I faced..

They insisted water heater uses 30mA and when I said ST rule since 1994 is also there already he looked at me and insisted "no such thing ever!"

If you still worry of easily trip (despite the good brands like ABB, Hager won't unless it is a life-threatening leak) then you can continue with 100mA for your lighting and fan, since human are usually not exposed to it. Keep the 30mA maximum for your plug points, and 10mA for water heater.

Bear in mind, you should in fact ensure your steel roof/steel-type awnings are grounded as well (a green wire to connect to your DB busbar directly) for safety - otherwise ((when there is a leak) anyone who climbs the roof to fix/repair something might get electrocuted to death since your lighting/fan RCCB sensitivity is only at 100mA. This also ST requirement actually.
It would be a miracle if people who install awning at his house would get an electrician to help pull a green wire connect to your earth busbar, whilst the awning are fitted with wired lamps/fans.

It doesn't trip often if you buy a genuine ABB or Hager 30mA, current models.
Yes 30 years back models even 300mA also trip every other rain lah. The technology then and now improved a lot.

Nah I show you lah, I moved to SG and left my apartment fridge running.
Its protected with whole house 30mA, ABB.
[attachmentid=11222407]
100mA for lights and fans?
You still use flourescent tube or halogen high-bay lamps at home??
seriously, 100mA?

Buy a good branded (read: ABB or Hager) 30mA whole house je lah. Dont waste money buying 100mA.

Yes but I think the issue we have in Malaysia is enforcement... You can see many electrical shops also selling DB box with 300mA rccb for domestic use. Wiremen taking contracts are mostly non-licensed whilst licensed ones simply charge with no control.

My house wireman luckily is really a knowledgeable person when I asked him to get ready earth wire connected to busbar for my future awning - he said "Singapore standard is like that" - by Singapore standard it does not mean just the guideline but also the enforcement!

Heheh, mind sharing your wireman’s contact? I think anybody who reads through this thread will want his contact after this. 😁

I don't have his contact, but only my main con's contact so you might not be getting the 1st hand price.... I am also waiting for the chance to get his

Better get plumbers who know how to install storage water heaters to do it for u. At the inlet, u will need to connect it to the pressure relief valve too (water source piping > pressure relief valve > isolation barrier > storage water heater's inlet).

Yes it looks like the one in your picture, but better purchase from the storage water heater's brand distributor so that u get more assurance that it is a confirm fit.

joven storage heater installation sample

https://images.app.goo.gl/h6zCNif8q7vJGr8b8

https://joven-electric.com/my/product/stora...my/jsh-my/jsh35

Hey Selene, taking a look at my water heater outlets, the cold outlets seem to have a plastic/rubber barriers already, so I don't need to install them there right? Just the ones with the copper tubing?

Suruhanjaya Tenaga recommends Isolation Barriers to be installed at both inlet and outlet. It is always better to be safe than sorry.